Jane Fonda and Michael Jackson used to be skinny dipping buddies!

The 77-year-old actress revealed she and Michael - who died of acute Propofol intoxication in June 2009 - enjoyed a naked swim together on the set of her 1981 movie On Golden Pond when Michael came to stay with her.

Check out the trailer for the 80s flick:

She told the Hollywood Reporter: "He came and stayed for 10 days. We lived together. I went skinny-dipping with him - also, by the way, with Greta Garbo!"

Jane also revealed that Katherine Hepburn, who starred as Jane's mother in the movie, was initially unhappy at Michael's presence on set.

She said: "When I first asked her permission, she was not happy. But then the crew said, 'You don't understand, it's Michael Jackson.' She was very prickly. I mean, she was a snob, she was very moody, she was very judgmental."

However, Katherine, who passed away in 2003, soon accepted Michael and even offered him career advice.

Jane said: "Michael wanted to be a movie star. He had just finished doing The Wiz, and he had a tape recorder with him, and every day I would bring him to the set, and in between scenes she would sit down in a chair and pull over a chair for him and tell him stories. And every story embedded a lesson."